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Updated: Jan 25, 2026
08:18
Three-Dimensional Reconstruction of Orbital Fractures
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Three-Dimensional In Vivo Analysis of Malunited Distal Radius Fractures With Restricted Forearm Rotation
Shingo Abe1,2, Kunihiro Oka1, Satoshi Miyamura1
1Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, Japan.
Summary
Malunited distal radius fractures can limit forearm rotation due to ligament tightness. Corrective surgery may restore rotation by improving distal radioulnar joint function.
Area of Science:
- Orthopaedic Surgery
- Biomechanics
- Radiology
Background:
- Malunited distal radius fractures (DRFs) can impair forearm rotation.
- The exact mechanism causing this rotational restriction is not fully understood.
Purpose of the Study:
- To investigate the biomechanical changes in the distal radioulnar joint (DRUJ) and ligaments in patients with malunited DRFs and restricted forearm rotation.
Main Methods:
- Retrospective analysis of 23 patients with malunited DRFs and restricted rotation.
- Computed tomography (CT) during forearm rotation.
- Creation of 3D bone surface models to evaluate DRUJ parameters and ligament path length (EPL).
Main Results:
- Dorsal angular deformities (DA group) showed increased EPL of dorsal distal radioulnar ligaments (DRUL) and impaired volar translation during pronation.
- Volar angular deformities (VA group) exhibited opposite findings.
- Distal radioulnar joint contact area was not significantly different between malunited and normal groups.
Conclusions:
- Tightness of the dorsal DRUL in DA malunited DRFs is a key factor limiting forearm pronation.
- Anatomical reduction of the distal radius may improve forearm rotation by addressing ligamentous and joint mechanics.
Keywords:
distal radioulnar jointdistal radius malunionforearm rotational restrictionin vivothree-dimensional analysiswristMore Related Videos
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